All true knowledge remains with God. There are certain ideas & pieces of knowledge that men just cannot learn. It remains out of reach, out of touch.

Also an interpreted theme in the song.

Unrelated to the song itself. It is interesting that different people interpret the song's meaning differently. Likely due to individual differences in perspective, history, culture, etc.

Makes me reflect. Is knowledge/wisdom contained solely in content and words? Or is knowledge/wisdom rather contained in the RELATIONSHIP, the INTERACTION, between past experience, previous knowledge (identity) and substance?

Currently I am inclined to go for the latter.